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Registration Number

0223U000489, 0122U000137 , R & D reports

Title

Research of the processes proceeding at one-stage decontamination and desulfurization of pig-iron before steel-smelting processing

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Head

Kysliakov Volodymyr H., Кандидат технічних наук

Registration Date

09-01-2023

Organization

Institute of Ferrous Metallurgy. ZI Nekrasov of the National Academy of Sciences of Ukraine

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 A thermodynamic analysis of the simultaneous removal of sulfur and silicon from cast iron was performed for two technology options. For the first variant of introducing powdered lime in an oxygen jet with the addition of aluminum, generalized equations of chemical transformation processes and corresponding analytical expressions were obtained for calculating the value of equilibrium constants depending on temperature for the zone of interaction of cast iron components with gaseous oxygen and for the zone of interaction of cast iron components with oxidation products with gaseous oxygen . Based on this, a graphical dependence of equilibrium constants on temperature was constructed. For the second technology of injecting a refining mixture of CaО-FeO-Na2CO3 into the carrier gas jet, generalized equations of chemical reactions and analytical expressions and graphical dependence of equilibrium constants on temperature were obtained by similar calculations. Conclusions were made regarding the sequence of oxidation of impurities, for the first technology, the use of manganese instead of aluminum for effective desilication is justified, for the second technology, the use of argon or nitrogen as a carrier gas is justified. Analytical evaluation of the results of processing liquid cast iron in a 350 kg ladle by injecting a slag-forming mixture was performed. The optimal ratio of refining slag components was obtained. The formation of homogeneous slag occurs at a melting temperature of 1175 - 1305 °C and a viscosity of 0.041 - 0.11 Pa. Laboratory experiments were conducted on "hot" models. 10 treatments were performed, during which the reagent was injected and samples were taken. The analysis of experimental studies of the process of one-stage desilication and desulfurization of cast iron was performed. Triple state diagrams of the influence of mixture components on the degree of removal of impurities during complex processing were constructed.

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Verhun Oleksandr S.
Dvoskin Borys V.
Eliseiev Volodymyr I.
Kysliakov Volodymyr H.
Manachуn Ivan O.
Petrusha Viktoriia P.
Rudenko Oleksandr L.
Tovstonoh Valentyna P.
Tohobytska Daria M.
Chubin Kostiantyn I.
Chuhui Valentyna V.
Shevchenko Anatoliy P.
Shevchenko Sergiy A.

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2023-01-09